A nymph-stage potato leafhopper (Empoasca fabae, right of center) rests on a leaf of alfalfa (Medicago sativa). The discoloration and scarring seen on the leaves is called "hopperburn," and is the result of a toxin contained in a leafhoppers saliva.

Entomology’s Dilip Venugopal and William Lamp, as well as their colleague Mitchell Baker of Queens College CUNY, whose paper "Climate change and phenology: Empoasca fabae (Hemiptera: Cicadellidae) migration and severity of impact," was published online today in the journal PLOS ONE. Their results suggest that climate warming could be exacerbating crop damage caused by the potato leafhopper, a tiny migratory insect pest that causes millions of dollars worth of damage to crops in the eastern United States every year. Using six decades worth of data, the study found that potato leafhoppers arrive an average of 10 days earlier than in the early 1950s, and their infestations are more severe in the warmest years. These effects correspond to an overall increase in years with warmer than average temperatures over the same time period. "The potato leafhopper is a significant pest in this country, spanning multiple crops across a large area. The scale of influence is huge," said Dilip Venugopal, a research associate in entomology at University of Maryland and co-lead author of the study. "Earlier arrival dates make it particularly important for farmers to get out early in the season and scout for leafhoppers," said William Lamp, an associate professor of entomology at University of Maryland and a co-author of the study.